Can I end a song at a certain spot?

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Newbie here.
I am teaching my students how to use the software, and they didn't complete their entire songs before their upcoming light show presentation.
I would like to tell the software to end at a certain time. Since the media file has already been imported, should I use an editor to cut the song or would that affect their editing file? Is there another option to ending the songs at a certain spot now that all of the work has already been done?